Terms of Use
Plain-language terms for using Reverb Calculator. The short version: the tools are free, the numbers are creative starting points, and your ears make the final call.
Using the calculators
Reverb Calculator is free to use, in your browser, with no account or registration. You may use the calculators and charts for personal and commercial music work alike — values you read here can go straight into your sessions, mixes and productions without permission or attribution.
The service is provided as-is and as available. We work to keep the tools online and correct, but we do not promise uninterrupted availability, and pages may change, move or be retired as the site is maintained and improved.
The numbers are starting points
Reverb and delay times on this site are starting points for creative work. Tempo-synced values are a reliable way to begin a mix, but they are not instructions, and they are not engineering or safety advice. Every room, voice, instrument and arrangement responds differently, and the final decision on any setting belongs to the person listening.
The same limit applies, more strongly, to acoustics. The RT60 Calculator produces an estimate for planning and learning, based on a single-frequency model. It is not a compliance measurement, and it must not be used as the basis for building-code, workplace-safety or contractual acoustic claims, which require proper measurement by qualified professionals.
Acceptable use
Use the site in ways that do not interfere with it or with other visitors. That means no attempting to disrupt the service, overload it, scrape it at abusive rates, misrepresent the site or its content as your own work, or use the tools to facilitate anything unlawful. Ordinary linking, quoting and building on the values in your own work are all fine and encouraged.
Intellectual property
Site content — text, design and code — is © Reverb Calculator, except for material credited to its sources. Short excerpts quoted with a link back to the page they came from are fine, and no permission is needed for that. Republishing whole pages, or presenting the tools or the Methodology content as your own, is not permitted. The formulas themselves are standard published mathematics and belong to everyone, as they should.
No warranty and liability limits
No warranty is made about the calculators or content — not about fitness for a particular purpose, and not about any result obtained by using a value from this site, whether that result is a mix you dislike, a missed deadline, or something larger. To the fullest extent allowed by law, liability for any loss arising from use of this site is excluded, and in any case limited to the amount you paid to use it, which is nothing.
These limits are written in plain language on purpose. If a number here matters to something expensive or safety-related, verify it independently before relying on it — that is good practice with any calculator, including this one.
Governing law and changes
These terms are governed by the law of the United States. If any part of them is found unenforceable, the rest continues in effect.
We may update these terms as the site changes; the current version always lives on this page, and continued use after an update means accepting the revised terms. Last updated: 12 November 2026.
Contact
Questions about these terms can be sent through the Contact page. If something here is unclear, ask — the terms are meant to be understood, not just agreed to.
Frequently asked questions
Can I use these values in commercial productions?
Yes. Values from the calculators can be used in personal and commercial work without permission or fees. The numbers are standard tempo and acoustic arithmetic; your mix is your own work.
Can I quote the site in an article or video?
Short excerpts with a link back to the page are welcome. Republishing a full page or presenting the tools and method as your own work is not permitted under these terms.
Are the RT60 results valid for building compliance?
No. The RT60 Calculator gives a planning estimate from a single-frequency model, not a measurement. Compliance and safety work requires on-site measurement by qualified acoustic professionals.
What happens if a calculator gives a wrong value?
Tell us via the Report an Error page and it will be checked and fixed. Legally, though, the tools are provided as-is with no warranty, so verify any value that a costly decision depends on.
Which law governs these terms?
The law of the United States governs these terms. They are written to be read plainly, and the Contact page is the place to ask if any part of them is unclear to you.